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Regulatory Capital Requirements (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Aggregate debit balances	2.00%
Stifel Nicolaus [Member]
Aggregate debit balances	27.40%
Net capital	182.1
Excess of minimum required net capital	168.8

Net capital is equal to the net worth of the broker dealer, less certain items such as exchange memberships, carrying value of securities not readily marketable, haircuts on marketable securities in proprietary accounts, furniture and equipment and other illiquid assets as defined.

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